Coggon Clouds

A partly sunny afternoon began to darken with gathering cumulus clouds as I neared the north Linn County Iowa town of Coggon around 4:40 PM, Wednesday, June 12, 2013. The cumulus tower seen above in both images--shot from my car window along Highway 13-- was billowing upward around 50,000 feet and was part of an approaching tornadic storm cell to the northwest. The top image was located about one mile south of Coggon, the bottom was located at 3rd Street South (seen at lower right) in town.